ASYNCHIO

ASYNCHIO

Specifies whether asynchronous I/O is enabled

Valid in: configuration file, SAS invocation

Category: Files: SAS files

PROC OPTIONS GROUP= SASFILES

Syntax
Syntax Description
Details
Comparisons
See Also

Syntax

ASYNCHIO| NOASYNCHIO

Syntax Description

ASYNCHIO: allows other logical SAS tasks to execute (if any are ready) while the I/O is being done. This might improve system performance.
NOASYNCHIO: causes data set I/O to wait for completion.

Details

If the ASYNCHIO option is not specified on the SAS invocation line or in the configuration file, its default value depends on the runmode with which SAS is invoked:

If SAS is invoked in DMR mode, LINE mode, or BATCH mode, the value is ASYNCHIO (NOSYNCHIO).
If SAS is invoked in DMS mode (FULLSCREEN) or OBJECTSERVER mode, the value is NOASYNCHIO (SYNCHIO).

Operating Environment Information: Most SAS system options are initialized with default settings when SAS is invoked. However, the default settings for some SAS system options may vary both by operating environment and by site. Option values may also vary both by operating environment and by site. For details, see the SAS documentation for your operating environment. [cautionend]

Comparisons

The ASYNCHIO system option is equivalent to the NOSYNCHIO system option. NOASYNCHIO is equivalent to SYNCHIO.

See Also

System Options:

SYNCHIO

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Valid in:	configuration file, SAS invocation
Category:	Files: SAS files
PROC OPTIONS GROUP=	SASFILES